Automatic lock for hoisting apparatus.



R. M. RODGERS. AUTOMATIC LOOK FORHOISTING APPARATUS.

APPLICATION FILED NOV. '7, 1908.

934,759, Patented Sept. 21, 1909.

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R. M. RODGERS. AUTOMATIC LOOK FOR. HOISTING APPARATUS.

APPLICATION FILED NOV. 7, 1908.

934,759,, Patented SeptZL 1909 I/NVENTOH fiogrZJf/Eod'yera m ATTORNE rsUNITE ROBERT MAXMILIAN RODGERS, OF NEW YORK, N. Y.

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AUTOMATIC LOOK FOR HOISTING APPARATUS.

Specification of Letters Fatent.

Patented Sept. 21, 1909.

citizen of the United States, and a resident ofthe city of New York,borough of Brooklyn, in the county of Kings and State of New York, haveinvented a new and Improved Automatic Lock for Hoisting Apparatus, ofwhich the following is a full, clear, and exact description.

The invention appertains to an improved locking device for hoistingappliances, more especially dumbwaiters, in which relatioir itautomatically operates under the tendency of the load to lock the car inany position of its movement immediately after the pull on the hoistingwheel ceases.

The invention in a general way consists of a. bearing, a sleevejournaled in the bearing, a drive shaft fixed to the sleeve, a liftwheelloosely mounted on the drive shaft, engaged with the sleeve and having aslight rotary movement on the shaft independent of the sleeve, a splitclamping ring inforced to turn with the sleeve and having a slightrotary movement independent thereof, and means extending between theends of the clamping ring and in engagement with the wheel for expandingthe ring by the slight rotation of the wheel on the shaft. Reference isto be had to the accompanying drawings forming a part of thisspecification, in which similar characters of reference indicatecorresponding parts in all the views.

Figure 1 is a side elevation of the mechanism at the top of a dumbwaitershaft having my improvements applied thereto; Fig. 2 is a centralvertical section substantially on the line 22 of Fig. 1; Fig. 3 is across-section on the line 33 of Fig. 2; Fig. 4 is a like section on theline l4c of Fig. 2; Fig. 5 is a perspective View of the lift-wheel; Fig.6 is a fragmentary perspective view of the inner portion of the sleeveforming an element of the lock; Fig. 7 1s a perspective view of onesection of the clamping ring; and Fig. 8 is a perspective view of thekey for expanding the clamping ring by the action of the lift-wheel.

In the application of my improvements to a hoisting appliance, such as adumbwaiter, a drive shaft 10 is journaled in bearings 11 and 12respectively, which are supported on cross-beams 13 spaced apart andbridging the top of the dumbwaiter shaft or well. The bearing 12, whichmay be located at either side, has an enlarged chambered orcounter-bored portion 14 on its inner face for containing the lockingmechanism, and in its reduced outer portion is journaled a sleeve 15splined or otherwise affixed to the shaft 10. It is ordinarily, however,loosely splined in order that it may be freely applied and adjusted onthe shaft to which it is held against sliding movement by a flange 16integral with its inner end, and a collar 17 attached to the outer endof the shaft. The flange 16 contacts with the outer face of thecounterbored or chambered portion of the bearing and extends only abouttwothirds the circumference of the sleeve, as is best seen from Fig. 4.At the opposite side of the sleeve from this cut-out'or interruptedportion of the flange 16, the sleeve is provided with a projection orsegmental boss 18.

On the shaft 10 is journaled or loosely mounted a lift-wheel 19 which isheld adjacent to the chamber 14 by a collar 20. The hub of thelift-wheel has at one end oppositely-arranged segmental slots 21 and 22respectively, the slot 21 being slightly longer than the segmentalprojection 18 which it receives. Within the chamber let is a clampingring constructed of two like sections 23, 23, one section of which isshown in detail in Fig. 7, wherein it will be seen that it is thickenedor provided with a projection 2 L on its inner face adjacent to one end,and radially slotted or rabbeted at the extremity as indicated at 25.The opposite portion of each ring section is enlarged internally to forma shoulder 26, and an oil-groove 27 is formed in the outer face of thering section between the shoulder 26 and the rabbeted end 25. hen thetwo sections of the ring are assembled in the chamber of the bearing,the projections 2st are received in the cut-out portion of the flange 16and are slightly less in combined-length than this cut-out portion,whereby the ring has a slight rotary movement in the sleeve 15, but isenforced to turn therewith when the driving shaft is revolved. The ringsare pressed outwardly against the walls of the chamber by a spring 28resting at opposite ends on the shoulders 26. The slots produced by therabbeted extremities 25 of the ring sections receive one end of alocking key 29, the opposite end of which projects into the slot 22 andis so shaped on the head that a slight rotation of the lift-wheel on thedrive shaft will cock or tilt the key to one side and force the ringsections apart into tight engagement with the inner curved wall of thechamber, thus securely locking the lift-wheel to the bearing.

On the end of the drive shaft adjacent to the bearing 11, and ordinarilyon the outside of the beam 13, a hoisting wheel 30 is secured, which isprovided with the usual operating cable 31 passing down through thedumbwaiter well. A cable 32 which passes over the lift-wheel 19 isrespectively attached at opposite ends to the counterweight and car, asis the usual practice, also passed over guidewheels 33 and 34, bothwheels being arranged in the same vertical plane with the wheel 19, withthe guide wheel 33 located at one side, the guide wheel 34 being soarranged as to direct that end of the cable passing to the car intovertical alinement with the drive shaft 10. The wheels 33 and 34 arejournaled in frames 35 having hangers 36, the latter having feetdesigned to contact with the under face of one of the crosssills 13, towhich it is secured. By thus constructing the frames or hangers of thesewheels, when the bearing 12 is positioned to have its inner face in aplane with the inner face of the sill 13, and the hangers secured fiatagainst the inner face of this sill, the wheels 33 and3t will beaccurately arranged without requiring measurement.

In the operation of the appliance, on pulling up the car by the cable31, the sleeve 15 will directly engage with the lift-wheel and force itto move therewith, together with the clamping ring and the locking key.hen, however, the cable is released, the tendency of the load to revolvethe lift-wheel on the shaft will operate the lock in the mannerexplained. In lowering the car when it is in a locked position, a slightpull on the cable 31 will carry the elements of the lock to a positionto release the lift-wheel from the hearing, as shown in Fig. 3, at whichtime the car can be readily lowered.

Having thus described my invention I claim as new and desire to secureby Letters Patent:

1. In a hoisting appliance, a bearing hav ing a chambered portion, asleeve journaled in the bearing having a segmental flange and asegmental boss arranged within the chambered portion of the bearing, aclamping ring made in two sections and provided with projectionsextending into the removed portion of said flange, a lift-wheel having aslotted hub receiving the segmental boss, and a locking key extendingbetween the sections of the ring and extending into the hub of thewheel.

2. In a hoisting appliance, a bearing having a chamber, a sleevejournaled in the bear ing having a segmental flange and a segmental bosswithin the chamber, a clamping ring made in two sections, each sectionhaving a projecting portion adapted to fit in the removed or cutoutportion of the flange and provided with a slotted end, a lift-wheelloosely mounted on the shaft with the hub thereof constructed withoppositely-arranged radial slots, one of which is of greater length andreceives the segmental boss, and a lock ing key extending into the otherslot of the hub and the slotted ends of the clamping ring sections.

3. In a hoisting appliance, a drive shaft, a sleeve fixed to the driveshaft, a lift wheel loosely mounted on the drive shaft clutched with thesleeve and having a slight rotary movement on the shaft independent ofthe sleeve, a clamping ring made in two separate sections enforced toturn with the sleeve and having a slight rotary movement independentthereof, a spring tending to force the sections of the clamping ringapart, and a key having a locking engagement with the wheel andextending between the two sections of the ring.

4. In a hoisting appliance, a drive shaft, a sleeve fixed to the driveshaft, a lift wheel loosely mounted on the drive shaft, movable with thesleeve and having a slight rotary movement on the shaftindependent ofthe sleeve, a split clamping ring enforced to turn with the sleeve andhaving a slight rotary.

movement independent thereof, and a tilting key engaged at opposite endsrespectively with the clamping ring and with the wheel for expanding thering by the slight rotation of the wheel on the shaft.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ROBERT MAXMILIAN RODGERS.

Nitnesses EDWIN Mncm, WALTER 1. Mncm.

